Semgrep in 5 Minutes for Vibe Coders

July 8, 2026 · 4 min read

AI coding tools generate working code fast, but they also generate security bugs fast. Semgrep is a lightweight static analysis tool that can scan your AI-generated codebase in minutes and flag the most common vulnerability patterns before they reach production.

Install Semgrep

The fastest way to install Semgrep is via pip:

pip install semgrep

Or use Homebrew on macOS:

brew install semgrep

Run Your First Scan

From your project root, run Semgrep with the default auto ruleset, which includes rules for JavaScript, TypeScript, Python, and more:

semgrep scan --config auto .

This pulls the latest Semgrep registry rules and runs them against your codebase. A typical vibe-coded project scan takes 30 to 90 seconds depending on code size.

What to Look For in the Results

Semgrep organizes results by severity. When reviewing output from AI-generated code, pay special attention to:

ERROR severity: These are high-confidence findings you should fix before shipping
WARNING severity: Patterns that are often bugs, especially SQL queries and authentication checks
Hardcoded secrets: The secret category catches API keys, tokens, and passwords in source files

Rules Most Relevant to Vibe-Coded Apps

AI coding tools most commonly generate vulnerable code in these areas. Run these specific rule categories if you want a faster, targeted scan:

p/nodejs — Node.js security rules covering injection, path traversal, and insecure defaults
p/javascript — General JavaScript security rules including prototype pollution
p/typescript — TypeScript-specific rules for React and Next.js apps
p/secrets — Detects hardcoded credentials and API keys in any language

Automate It in CI

Add Semgrep to your GitHub Actions workflow to catch security bugs on every pull request, before AI-generated code gets merged into your main branch:

- name: Run Semgrep
  run: semgrep scan --config auto --error .

For a fully automated scan with zero configuration, use Hammering.ai. Paste your repository URL and get a comprehensive security report covering all the vulnerability classes Semgrep and our custom rules detect, organized by severity and fix priority.